Abstract: In a method for heating up the intake air of an internal combustion engine during the preglow phase or start-up phase, the heating power is controlled by a control unit of the engine electronics as a function of the operating data of the internal combustion engine. During the preglow phase, the heating element is initially supplied with full current until the heating element reaches its reference temperature. After the reference temperature has been reached and until the start-up phase, a post-heating phase begins in which the heating element is kept at a constant temperature by way of a relatively low power. During the start-up phase, in a first time period, the heating element is switched off, and in a second time period in which the speed of the internal combustion engine is raised to the starting speed, the heating element is switched on again.

Abstract: A method for heating up the intake air of an internal combustion engine (8) during the preglow phase or start-up phase by means of at least one electrically heatable heating element (12) in the intake line (10) of the internal combustion engine, the heating power being controlled by a control unit (13) of the engine electronics as a function of the operating data of the internal combustion engine, characterized in that during the preglow phase (1,2,3), the heating element (12) is initially supplied with full current (1) until the heating element reaches its reference temperature and in that after the reference temperature has been reached and until the start-up phase, a post-heating phase (2,3) begins in which the heating element (12) is kept at a constant temperature by means of a relatively low power, and in that during the start-up phase, in a first time period (4a), the heating element (12) is switched off, and in that in a second time period (4b) in which the speed of the internal combustion engine i

Abstract: In the method, the intake air for an internal combustion engine is heated both during the starting and/or warm-running phases by at least one electrically heatable heating element arranged upstream of the air inlet to the internal combustion engine and wherein the heating period for the pre-start is selected on the basis of the temperature of the cooling water of the internal combustion engine and the temperature of the unheated air taken in by the internal combustion engine, and the heating period for the post-start is selected independently of the pre-start heating time and selected solely on the basis of the cooling-water temperature.

Abstract: The invention relates to a process and apparatus for heating the intake air in internal-combustion engines by means of a flame starting system with at least one glow plug. The apparatus is controlled in such a manner that the glow plug is continuously preheated during a first time period and is operated in pulses in a following second time period and the glow plug is switched off after a safety time has elapsed. The glow plug is preheated after it has been switched off, taking into account the instantaneous glow plug temperature during the cooling and the voltage available in such a manner that the temperature required for a repeat start is reached within a narrow tolerance band.

Abstract: A flame-type heater plug for an internal combustion engine includes a plug housing having a proportioning insert for the fuel supply, a heater bar secured at one end in the plug housing with a free end extending outwardly of the plug housing, and an evaporation tube extending along a substantial length of the plug housing from the proportioning insert and surrounding the heating bar to form an annular interspace therebetween. The free end of the heater bar extends from the evaporator tube and is surrounded by a flame tube including passage orifices for passage of intake air into the interior of the flame tube. A helical swirl channel on the outer surface of the heating bar in the plug housing forms a fuel connection between the proportioning insert and the evaporator tube opening into the annular interspace. The passage orifices may be provided with deflectors to prevent direct contact of the heating bar by the air flowing therethrough.

Abstract: A process and device for heating the intake air in internal-combustion engines by means of a flame starting system is disclosed which contains at least one heater plug and has a control unit which supplies the heater plug with voltage for a specific preheating time.

Abstract: The invention relates to a flame-type heater plug for an air-compression fuel-injection internal-combustion engine, especially a direct-injection and superchargable internal-combustion engine. The heater plug includes a heater tube arranged in the course of a plug housing and protective tube and has an integrated first control coil at a level of passage orifices in the protective tube, heating coil and a second control coil arranged outside the protective tube at a side of the heating coil opposite the first control coil. A heater-tube portion which projects from the protective tube and is located in the flow path of the intake air in the suction pipe of the internal-combustion engine is provided in which the second control coil is arranged for further influencing the power of the heating oil.

Abstract: A low pressure fuel circulation with fuel preheating for an air-compressing injection-type internal combustion engine, preferably for commercial vehicles, in which a heat-exchanger and a by-pass by-passing the fine filter and having an excess pressure valve opening in dependence on a predetermined maximum pressure acting on the fine filter as a result of paraffin formation is arranged in an inlet line leading to a high pressure injection pump.

Abstract: An exhaust brake system for internal combustion engines includes an exhaust valve within the exhaust duct which is closed or opened for the braking of a vehicle during engine operation by means of an engine brake valve. A magnetic valve is arranged within the control duct and is controlled by an electrical circuit connected to a terminal of the ignition switch and to the positive terminal of the generator in such a manner that the exhaust valves are closed during the starting of the engine and when the engine is idling. The formation of white exhaust smoke during cold starting of the engine and the formation of blue exhaust smoke during idling of the engine is decreased.

Abstract: The invention relates to a cold-start assisting device for motor vehicles with which under extreme cold conditions, in addition to the normal fuel, auxiliary fluid is also injected into the intake of the vehicle combustion engine by means of a control switch. With this operating or control switch it is also possible after a successful start to support the running of the combustion engine with auxiliary injection. In order to prevent intentional or inadvertent operation of the auxiliary injection with a stalled engine, the control switch exhibits an auxiliary working contact which is connected with a terminal of a motor driven generator.